Sewing machine



Jan, 1l 1927.v 1,613,773 J. SCHREIBER SEWING MACHINE Original Filed May 21, 192] Patented Jan. l1, 1927.

UNITED STATES PATENT OFFICE.

JOHN SCHREIBER, OF ST. LOUIS, MISSOURI. I

SEWING Machine.

Original application Ied May 21, 1921, Serial No. 471,314, Patent No. 1,440,556, dated January 2, 1923.

Divided and this application filed December 11, 1922.

rlhis invention relates to sewing machines, and has special reference to the presser foot mechanism.

An object of the invention is to provide an efficient presser foot mechanism for use in sewing machines that are designed and adapted for thiclz and heavy work, such as sewing machines for use in manufacture of harness, shoes, etc.

The subject-matter of the present invention is divided from my prior-application Serial No. 471,314, filed May 21, 1921, patented January 2, 1923, No. 1,449,556, and an additional object of the invention is to provide presser foot equipment for the sewing machine of my said prior application for holding the work upon the work plate and for releasing the work for lateral movement during the operation of the machine.

of the machine with the thread feeding attachment removed and showing my improved presser foot mechanism.

Fig. 2 is a side elevation of the presser foot mechanism.

Fig. 3 is a sectional view showingthe brake release device.

The machine in connection with which the present invention is shown comprises a front head frame 1 at the forward end of which the work supporting plate 2 is located for supporting the work in position to receive stitches formed by the stitching mechanism of which the needle 3 is a part.

The presser foot 4 extendsfrom a rocking supporting member which comprises a ring 5 supported for rocking movements on a boss 6 extending from one wall of the front head frame 1. A rod 7 has its forward end pivoted to the presser foot support 5 se that forward movement of said rod will lower the presser foot 4 to press the work on the work plate 2. The presser foot 4 extends downwardly and laterally from the support 5 and has a slot therein to receive the needle 3. The rod 7 has its rear end supported within a sleeve 8 carried by a pivot support 9. The support 9 is swingingly supported by a pin 10 and is connected with an operating lever 11. IIhe lever 11 embraces the support 9 between the arms of the fork at the lower end of said lever, and the connection between the lever 11 and the support 9 is pivotal. The axis of the pivot In the drawings, Fig. 1 is a front elevation Serial No. 606,083.

12 connecting the lever 11 with the support 9 1s at right angles to the aXis of the pivo 10. v

v fis shown in Fig. 2 the lever-11 is in its' forward position and the presser foot 4 is raised. l/Vhen the lever 11 is moved rearwardly the spring 13, which encircles Before the time arrives for the work to be moved laterally upon the work plate the presser foot 4 is held rigid upon the work by a brake device or clutch provided for that purpose. This brake device or clutch comprises a brake shoel or clutch member 15 located within a groove or channel in the rear peripheral portion of the presser foot support 5. The brake shoe or clutch device is pivoted on a support 16. An elongated slot 17 receives the support 16, forward movement of the brake device on the support being limited by an adjustable abutment 1,8. The abutment 18 is in the form Vof a screw carried by the brake device and has its forward end serving as an abutment to contact with the support 16.

of the brake shoe operating lever 19 contacts with the brake shoe 15 and presses the brake shoe into rigid engagement with the presser foot support 5 when the rear end of the operating lever is raised by the spring 21. The brake shoe operating lever 19 has an arm 23 extending upwardly from the spring 21 and provided with an elongated part 24 on thev upper end thereof constituting a con- `projection 28 the spring is compre tact or abut-ment member 'for the roller 25 on the lovver end of the pivoted support 9 that is controlled by the lever 11.

The support 9 and the arm S of the bralre shoe operating lever, with the part 24e thereon, constitute a species o1 toggle whereby movement of the lever 11 Will control the brake spring lever 1'. lllhen the lever 11 is in its rear position the support 9 is beyond the forward end oit the part 2&1-, permitting the spring 21 to raise the rear end of the lever 19 and cause the cam 22 to press the brake shoe 15 in rigid engagement with the presser foot support he parts occupy the positions last described Whenthe machine is in use, so that :tor certain desired operations the presser toot will hold the Worlr rigidly upon the Work plate 2. nt the proper time, however, the bra-lie is released to permit lateral movement of the Work. This is accomplished by carried by roller the cam bar 27 passing over the pin or projection 28 on the brake shoe operating rever 19. As the roller 2G passes over the pin or ssed, thereby releasing the cam 22 from press re against the brake shoe, and permitting the brake shoe to release the presser foot support. rlhis permits the Work to be moved laterally, the presser foot yielding to adpist itself to any irregularities in the thickness of of the Worlr, While the serrated Work plate 2 prevents Athe Worlr from slipping tor- Wardly.

Vlhe spring 21 constitutes an elastic aotuator for the brake shoe. operating device. rlhe tension of the spring may be varied by adjust-ment of the support 29, upon which the spring seat 30 is mounted. he spring 21 yields to the different mechanims which operate to control the application and release of the bralre shoe to and from the presser toot support. 1t vrill be understood that during the operation the bralre shoe is held in s the presser toot support intermittent intervals in n the Work is being shifted laterally. At the proper time in the forward movement of the` cam bar 27, the brake shoe is released by operation of the roller 26 against the part 28. TTfhen the cam bar 27 is moved rearwardly the roller 26 is disengaged from the projection 28, 'permitting the spring 21 to reset the bralre to hold the presser foot positively upon the Work. hese operations are repeatedly performed and as an incident to the operation of the machine and the timing of the operation is properly maintained throughout.

C o, except during the iv ncl From the foregoing it will loe seen that myinvention is a highly eiilcient and satisfactory mechanism for use in a machine of the type for Which it is designed. rlhe construct-ion and arrangement or the parts may be varied in equivalent respects Without departure from the nature and principle of the invention.

l do not restrict myself unessentially, but what 1 claim and desire to secure by Letters Patent is 1. .ln a sewing machine, the combination ot a presser foot, a rod having one end pivoted to the presser foot, a spring encircling the rod, a lever, a sleeve supported by the lever and movable thereby to compress said spring and cause said spring to press the presser toot on the Work, a brake, a pivot on which said bralre is mounted, an additional pivot, a lever on said additional pivot Jfor setting said bralre to hold the presser foot on the Work, and a spring for actuating said last-named lever to move said brake to and hold said brake in set position.

2. ln a sewing machine, the combination of a presser foot, a rod hai/ing one end pivoted to the presser toot, a spring encircling the rod, a lever, a sleeve supported by the lever and movable thereby to compress said spring and cause said spring to press the presser i''oot on the Work, a brake, a pivot on which said brake is mounted, an additional pivot, a lever on said additional pivot for setting said brake to hold the presser toot on the Work, a spring for actuating said last-named lever to move said brake to and hold said brake in set position, and means operated by said first-named lever to release said second lever from said brake when said first lever is moved to position to release said first spring from compression.

3. 1n a sewing machine, the combination of a presser toot, a spring for holding the presser foot on the Work, a lever, a part supported by said lever for engaging and holding said spring under tension to press the presser foot on the Work, a brake` for holding the presser foot on the Work, a sup-v port on which said brake is operated, an additional support, a lever pivoted on said additional support movable to and from position to set the brake against the presser foot, a spring for actuating said second lever to position to set the brake, and a device operating to release the bralre intermittently to permit the presser toot to yield While said 'lirst lever holds said first spring under compression,

l. 1n a serving machine, of a presser toot, a spring for holding the presser Jfoot on the Work, a lever, apart supported by said lever for engaging 4and holding said spring under tension to press the presser toot on the Work, a brake for holding the presser foot on the Work, a support on vhich said brake is operated, an additional support, a lever pivoted on said additional support movable to and from position to set the brake againstthe presser foot, a spring for actuating said second lever the combination to position to set the brake, a device operating to release the brake intermittently to permit the presser foot to yield While said first lever holds said iirst spring under compression, and means operated by said first lever for moving said second lever in opposition to said second spring to position to release the brake.

5. In a sewing machine, a pivoted presser foot, a spring, a support for said spring pivoted to the presser foot, a lever, an element supported by said lever engaging said spring and arranged to `cause said spring to press the presser foot on the Work When said lever is moved to one position, a brake settable to hold the presser foot on the Work, a lever for setting said brake, a spring for actuating said lever to position to set said brake, and means operated by said first lever to release said second lever from said brake when said rst lever releases said first spring from tension and permitting said second spring to actuate said second lever to set said brake when said first lever is in position holding said first spring under tension.

6. In a sewing machine, a pivoted presser foot, a spring, a support for said spring pivoted to the presser foot, a lever, an element supported by said lever engaging said spring and arranged to cause said spring to press the presser foot on the Work When said lever is moved to one position, a brake settalole to hold the presser foot on the Work, a lever for setting said brake, a'spring for actuating said lever to position to set said brake, means operated by said first lever t0 release said second lever from said brake when said first lever releases said first spring from tension and permitting said second spring to actuate said second lever to set said brake when said iirst lever is in position holding said first spring under tension, and means for intermittently releasing said second lever from said brake While said first lever holds said first spring under tension.

JOHN SCHREIBER. 

